I have the Longevity steam cabinet. We have a finished basedment and there is a little alove where it fits just perfectly. My biggest problem is when someone comes over and they have reason to come down to the basement, I inevitably have to explain what the strange looking thing is.
You just fill up an internal reservoir, so no water hookup is needed.
Steam showers are wonderful and I plan to build one myself one of these days (I even have the steamer). But sadly they would not be suitable for ozone. The ozone needed to surround your body is far too strong to breath.